Advertisements
Advertisements
Question
Iron rims are heated before they are fixed on the wooden wheels. Explain the reason.
Advertisements
Solution
The wooden wheels of a bullock-cart are fitted with iron tyres. To ensure a tight fit, the tyre is made slightly smaller in diameter than the wheel. The tyre is first heated due to which it expands. The heated tyre is then fitted on the wheel. When the tyre cools, it contracts and makes a tight fit on the wheel.
APPEARS IN
RELATED QUESTIONS
Write true or false for a given statement.
Equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.
Name two substances which expand on heating.
An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.
Select good and bad conductors of heat from the following:
copper, mercury, wood, iron, air, saw-dust, cardboard, silver, plastic, wool.
Explain why the water pipes are covered with cotton during very cold weather.
What are the land and sea breezes? Explain their formation.
Why do we prefer to wear white or light coloured clothes in summer and black or dark coloured clothes in winter ?
During day time, air blows from ______ to ______.
______ is the only matter on the Earth that can be found naturally in all three states.
When heat energy is added to a substance, the kinetic energy of its particles ______ and so the particles move at a higher speed.
